As illustrated by FIG. 5, the keys 516, such as the user and instrument keys described herein, may be shared across the exchange platform 102 and the service provider platform 440. In addition, in some examples, references, such as the instrument reference 520 and user reference 502, may be shared across entities. These identifiers, and the mapping schemes described herein, allow the exchange platform 102 to reference a service provider instrument 518 without knowledge of persistent credentials 514 (e.g., card numbers, etc.) of the service provider instrument 518. As described herein, one or more of the keys 516 and/or references may be provided to the service provider platform 440 individually, or in any combination. In some examples, each of the keys 516 and the references may be provided to the service provider platform 440 in a redundant process that allows the service provider platform to verify that a communication is provided by the exchange platform 102 (e.g., an entity with access to the specific set of keys and references, etc.).
